[Acquired deficit in factor X associated with amyloidosis. One case (author's transl)].

A 75-year-old woman developed a haemorrhagic syndrome due to an acquired deficit in factor X whic resulted in death from gastrointestinal bleeding. This deficit was associated with primary amyloidosis. The relationship between the two conditions, the particular features of the haemostatic picutre and the ineffectiveness of replacement therapy are discussed.